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首页> 外文期刊>Journal of oceanography >Biogeochemical responses associated with the passage of a cyclonic eddy based on shipboard observations in the western North Pacific
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Biogeochemical responses associated with the passage of a cyclonic eddy based on shipboard observations in the western North Pacific

机译：基于北太平洋西部船上观测值的与旋风涡流相关的生物地球化学反应

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摘要

A shipboard high-resolution hydrographic survey in the subtropical region of the western North Pacific conducted from October to November 2008 detec-ted part of a cyclonic eddy around 30°N, 145°E. This eddy had propagated westward in the region south of the Ku-roshio extension for at least 6 months as a wavelike disturbance. Within this eddy, isopycnals shallowed between a depth of 600 m and just below the surface mixed layer. In addition, maximal dissolved oxygen concentrations were observed in the subsurface layer between depths of 50 and 100 m. Nitrate was depleted within this subsurface maximal oxygen layer. These results suggest that nutrients in the deeper layers were supplied into the euphotic layer as a result of the uplift of isopycnals in the eddy, fueling the photosynthesis of phytoplankton in the subsurface and emitting an excess of oxygen due to new production. Compared with the outside of the eddy, the enhancement of oxygen and the decrease of nitrate in the center of the eddy were estimated to be 2.7 mol O_2 m~(-2) and 0.22 mol N m~(-2), respectively. The primary productivity calculated using the eddy transition speed of 5.1 km day~(-1) was 548 mg C m~(-2) day~(-1) at the center of the eddy. The enhanced primary productivity due to the passage of the eddy is likely to have an important role in the ecosystem and on material cycling in the subtropical region.
机译：2008年10月至2008年11月在北太平洋西部亚热带地区进行的船载高分辨率水文勘测，检测到了北纬30°，东经145°附近的旋风涡旋的一部分。该涡流在库鲁希奥延伸以南的区域向西传播了至少6个月，为波浪状干扰。在该涡流内，等深线在600 m的深度与表面混合层的正下方变浅。另外，在50至100 m深度的地下层中观察到最大溶解氧浓度。硝酸盐在该地下最大氧气层内被耗尽。这些结果表明，由于涡流中等位面体的上升，更深层的营养物质被供应到了富营养层，这为地下浮游植物的光合作用提供了燃料，并由于新的生产而释放出过量的氧气。与涡流外部相比，涡流中心的氧气增加和硝酸盐的减少分别为2.7 mol O_2 m〜（-2）和0.22 mol N m〜（-2）。使用5.1 km day〜（-1）的涡过渡速度计算出的初级生产力在涡中心为548 mg C m〜（-2）day〜（-1）。由于涡流的通过，初级生产力的提高很可能在亚热带地区的生态系统和物质循环中发挥重要作用。

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  • 来源
    《Journal of oceanography》 |2014年第5期|435-445|共11页
  • 作者

    Chiho Sukigara; Toshio Suga; Katsuya Toyama; Eitarou Oka;

  • 作者单位

    Hydrospheric Atmospheric Research Center, Nagoya University, Nagoya, Japan;

    Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan,Research Institute for Global Change, Japan Agency of Marine-Earth Science and Technology, Yokosuka, Japan;

    The Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, USA;

    Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mesoscale process; Physical-biological process; Cyclonic eddy; Primary productivity; Nutrient supply;

    机译：中尺度过程;物理生物学过程;旋风涡初级生产力;营养供应;

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